Abà « Ḥafá¹£ ÿUmar ibn Saÿd ibn Abë WaqqÃÂá¹£ (; died 686) was the son of Sa'd ibn Abi Waqqas, a companion of the Islamic prophet Muhammad. He was a member of the Banu Zuhra tribe. Umar ibn Saÿd is primarily known for commanding the Kufan army sent by Ubayd Allah ibn Ziyad to confront Husayn ibn Ali at the Battle of Karbala in 680 CE, an engagement that led to HusaynâÂÂs death.
Little is known about Umar ibn SaÿdâÂÂs childhood. He lived in Kufa and established relationships with the ruling Umayyads. According to Tabari, after the arbitration at Dumat al-Jandal following the Battle of Siffin in 657 CE, Umar approached his father, Sa'd ibn Abi Waqqas, urging him to attend the arbitration. He emphasized that as a companion of Muhammad and a respected member of the community, his father had the most right among those present to the caliphate. Sa'd, however, refused, citing Muhammad's warning about fitnah and choosing to remain neutral.
Umar ibn Saÿd held administrative positions in Kufa and was trusted by the Umayyad authorities. He served as a tax collector in Hamadan and testified against Hujr ibn Adi during his trial.
In 680 CE (61 AH), Umar ibn Saÿd commanded the Kufan army sent by Ubayd Allah ibn Ziyad to confront Husayn ibn Ali at Karbala. Although initially reluctant to fight, he complied after Ibn Ziyad threatened to revoke his governorship of Rayy.
He arrived with a force of about 4,000 men, which later grew according to some sources. Umar ibn Saÿd coordinated the encirclement of HusaynâÂÂs camp and ordered measures to deny the defenders access to water, stationing horsemen along the route to the Euphrates. Husayn attempted negotiations and reportedly offered to leave or reach a compromise, but Ibn Ziyad refused and ordered Husayn to either submit or be attacked. Umar ibn Saÿd reluctantly carried out these orders, reportedly remarking that Husayn would not submit because of his proud soul.
During the battle, Umar ibn Saÿd directly commanded the Kufan army, ordering the burning of tents, encirclement of HusaynâÂÂs companions, and systematic attacks that led to the deaths of almost all of HusaynâÂÂs followers and relatives. He was present when Husayn was struck, surrounded, and ultimately killed. Reports indicate that HusaynâÂÂs family pleaded with him to intervene, but he remained passive and carried out Ibn ZiyadâÂÂs orders. He oversaw the taking of the survivors, including HusaynâÂÂs son Ali Zayn al-Abidin, as prisoners and the dismemberment or trampling of the dead as previously instructed.
As the field commander, Umar ibn Saÿd executed Ibn ZiyadâÂÂs instructions to blockade the Euphrates and engage Husayn's forces. He presided over the failed negotiations, the final assault, and the subsequent dispatch of survivors and spoils to Kufa.
In 686 CE (66 AH), Mukhtar al-Thaqafi executed Umar ibn Saÿd and his son Hafs, along with other prominent figures who had participated in the Battle of Karbala, as part of his campaign to avenge HusaynâÂÂs death.